Improved electro-magnetic burglar-alarm



J. HALLBR.

BURGLAR ALARM'.

No. 30,141. Patented Sept. 25, 1860.

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UNITED 'STATES 'PATENT OFFICE.

JACOB nALLaa, or ANN Anson, MIcHIGAN.

IMPROVED ELECTRO-MAGNETIC BURGLAlR-ALARNI.

Specification forming part of Letters-'Patent No. 30,l4l, dated September 25,1860.

To all whom it may concern:

Be it known that I, J AcoB HAL-LER, of Ann Arbor, in the county of VVashtenaw and State of Michigan, haveinvented a new .and Improved Burglar-Alarm; and I do herebydeclare that the following isa f ull, clear, and exact description of the same,'reference beinginad to the accompanying drawings', makinga part of this specification, in which-v Y Figure lv represen-ts a front elevation of my invention. Fig. 2 is a transversevertical 'section ot' ditto, the lineax, Fig. 1,'indicating the plane of section. Fig. 3 is a horizontal sec'f tion of the saine taken in the plane indicated by the line y y, Fig. 1. Fig. 4is a planor top view of the electro-magnetic alarm Which I use in connection with the' apparatus represented in thel previous gures. Fig. 5 is a front elevation of the self-lighting apparatus connected with and operated by the alarm. Fig. 6 shows a' horizontal sectionv of a simple device 'arranged according to my invention for 'the purpose of protecting a door or Window.

Similar letters of referencein all the gures indicate corresponding parts.

The principal object'ofthis invention is to protect the entire frontof the house against the stealthy entrance of burglars or other persons with evil designs and theinvention consists, first, in the arrangement of' a series of wire ropes or chains extending all the way along the front or s'ide of the house and passing over pulleys which are secured in the ful-7 crated ends of a series of double-armed'levers,.

the long arms of which connect with a rockshaft in suchl a manner that a slight alteration in the tenison of one of the ropes or chainspro.- duces sufficient motion of the rock-shaft to bring an arm extending from the saine incontact Witlia spring, thereby closing the circuit y in such a manner that the electro-magnetic alarm can b estopped and started at pleasure; fourth,'in the/combination, with an electromagnetic alarm, of a spring-frame, in such a manner that the slightest pressure onsaidv frame closes the circuit and causes vthe alarm to sound, and that by properly arranging said spring-frame on the insdeof a door or window yan uncalled-for entrance of personsl from the outside is brought to the attention nf theocu'.' pants ofthe room or house.

^ To enable vthose skilled in the art to make and` usemy invention, I willp roceed to describe its construct-ionv and operationwith reference to the drawings.

A represents a box or case, which is firmly secured to the door near to the wall and close up to the end of the front orusde ofjthe house which is to be protected by the apparatus, and a series of wire ropes or chains, B, extend from the box Ato a case, C, (s ce Fi g. 3,) which is also secured. to the floor close to the other en'd of the front or side to be protected." The ropes are intended to be about 3 or 4 inches apart, and they are all connected so as'to form one continuous rope passing around pulleys b b in the box A, itsends being connected to a Wind lass, D, which serves'to regulate the tension' of 'the rope and to hold that portion which is not needed. The `pulleys a in the case Care fastened on arbors a', the bearings of which are fixed in the sides ot' the case. The pulleys bb in the box A on the other hand are arranged in the forked ends of double-armed levers' c d, and these levers are fulcrated o n pivots e, passing through brackets D, that are rigidly attached to the inside of the box A. The long arms d of the levers c d are provided with dogsf, and if said arms are depressed the dogs f come in contact'with pins g,- which project from a vertical rock-shaf E, and turn'tlie latter in the directionmarke -near it in Fig. 3 against a spring, h, (see Fig. 1,) which has the tendency to turn saidshaft in the opposite direction.

' The rock-shaft E has its bearings in lugs z', attached tothe side ofthe box A, and it connects by means of -a Wire, 10, with one-say the negative-pole of a galvanic battery, and an arm, j, extends from the rock-shaft between two springs,kvk, which. connect by a wire, ll,with the -other positive pole of the battery. This connection, however, is not direct, but it passes through the electro-magnetic alarm F, which is represented in Fig. 4. The wire 11 connects through the stud l with one end, 12, of the helix of the electro-magnet. The otherend, 13, of this helix connects, through the post fm,- the armature n, spring '0, and post` p, with a wire, 14, which leads to the' plate q, and this plate connects, through the circuitbreaker r and Wire 15, with the stud s, which is in direct communication with the positive pole of the battery, If the rock-shaft is now turnedin one direction orin the other so as to bring the arm j in contact with one or the other of the springsk 7c the current is-closed and the armature n is attracted by the electro-magnet. By this motion of the armature the hammer't, which is connected to the armature, is brought in contact with the bell u and a sohnd is produced,"A but at the same time the connection between the [spring o-and armature-n is inter.

ruptcd, the lcurrent is broken, and the armature impelled by thesprin g a', which forms the connection between it andthe post m, is carriedv back to its original position. The current is again closed and a second stroke of the hammer against'thebell is pro-duced, and this op- `eration'will continue until the c'urrentis broken either by removing the arm j from the spring k or k', with which it had been'in contact, or' by means of the circuit-breaker r. This circuitbreaker turns on a post, r, anda metal pin, r', connected to its under side, sweeps over the surface of the plate q. An insulating-plate, g', is inserted in this surface, and if thecircuitbreaker is turned so as to bring the pin 7" on this insulating-plate the current is broken.

A cord, ri, serves to turn the circuit-breaken rso as tobring the pin r' on the insulatingplate g and to break the circuit.

In orderto close the circuit again the wire 13 connects by a Wire, 16, with the' plate c, and

a circuitbreaker,w, whichturns on a post, 10", is brought in contact with' the surface of the plate rvby means of a pin, w. vAn insulatingplate, o', isinserted into this surface, and the post fw* connects by awire, 17, with the post s', which is in direct communication with the positive pole of `the battery. vAs long-'as thev circuit-breaker w remains in contact with the insulating-plate c the circuit through the wires 16 and 17 is broken; but if the circuit-breaker wis turned so as to bring the pin wvl in contact WithztheV metal surface of the plate-v the cir- .cuit through the-wires16 and `17 is closed. A cord, wserves toturn the circuit-breaker and vto close the circuit through the wires 16 and original position. By these means the circuit l is made to pass again through the helix of the velectro-magnet to the wire 13; thence through the post m, 4armature n, spring o, post p, wire 14, plate g, circuit-breaker r, wire l5, and stud s back to the positive pole ofthe battery, and the hammer t will continue to strike against the bell until the current is again broken.

-In order to arrange this apparatus in ahouse, the boxlA is fastened on one end of the side or front of the house, and the case C on the other end, as above described, and the chains orjropes B are stretched by means of the windlass D until the arms d of the levers c d turn the rock-shaft E to such a position that the arm istands exactlybetween the two springs k k. The correct position of this arm is determined by a pointer, j, that passes out through the side of the box A, and if,'now, the connection of the wires with the battery and with the alarmF is made, as above described, the slightest change in the tension of fthe ropes -causes the arinj to-come in vcontact with one or the other of thel springs k 7s', and the alarm .is sounded. lnstead'of using an electro-magnetic alarm,a common alarm,operated by a spring .or weight,may be used; and in this case the arm j'i's bent, as shown in Fig. 3, forming a depression, ji,which, when the alarm is set, receives the end a2 of a bell-crank lever, z2-b2, the forked arm b2 of which works against a cam, c2, which connects with a stop, d2, that.

retains the-Wheel e2 when .the same is wound up against a spring, f2. Anarm, g2, on the arbor of this Wheel connects by means of a rod, hz,with the alarm.- If the ivheel is turned so as to bring the recess c2* in its face opposite the stop dz, the latter is lnot allowed to drop ,into said recess until the depressi-on j* of the arm j is brought exactly opposite the end a? of the bell-crank lever a2 b2; 'and if the Wheel c2 is set by bringing the stop dzinto the-recess czhthe slightest alteration in the position-of the arm j causes the stop-clz to release the wheel e,- and to soundthe alarm,

'lhgarm j is set in the samemanner, as above described, by stretching the ropes or chains B until fhe'a'rms'd of the levers c" d turn the rockshaft Efar enough to bring the arm j in the proper position; and the slightest change i'n the tension of said ropes or chains causes the arm j to change its position and to release the wheel e2.

W here it is desired to protect only one window or dooragainst the intrusion of outsiders, a simple spring-frame, G, such as 'represented in Fig. 6, may be substituted for the cases A and B. One of the metal bars Z2 of. this springframe connects by a wire, 102, with the negative poleo'f-the battery, and a spring, m2, which is attached to the non-conducting portion n2 of the spring-frame, connects bya wire, 112, with the electro magnetic alarm F. The spring m? extends between the looped end of an arm, o2, which connects with the metal bar l? and if properly setthe spring stands exactly in the center of the loop at the end of the arm o2 Without touching any portion of the same. This spring-frame is arranged on the inside of a door or Window in such a position that in opening the door or window the bar l2, with the arm o2, is depressed, and the arm 02 is brought in contact with the spring m2, thereby closing the circuit and causing the alarm to sound. The hammer t of the electromagnetic alarm F, or, in case a common springalarm is used, its hammer, serves-to operate a self-lighter, H. .To e'ectthis a pin,p2, is inserted into the hammer t, and a lever, g2, which is pivoted to the bed-plate of the alarm or to any other convenient spot, connects by a rod,

l r2, with thc bell-crank lever s2 t2, which carries the stop u2 to retain the friction-wheel c2. A clamp, IL02, retains the match, which is placed on the face ot' the friction-Wheel, as shown in red outlines in Fig. 5, the friction-wheel having been wound up against a suitable spring. As soon as the hammer t begins to strike, the pin p2, by coming i-n contact with the lever g2, releases the friction-Wheel v2, andthe match is lighted. Alamp, l, is placed in suoli a position that the same receives the light from the match. Bythese means the occupants of a house or room are not only roused, it' some person undertakes to attempt an entrance, but they are also provided with alight, so that vthey can recognize the intruder or intruders,

or that they can take at once the proper steps to pursue them.

Having thus fully described my invention,

what I claim as new, and desire to secure byy Letters Patent, isi l. The arrangement of a series of ropes or chains, B, extending over pulleys a b, in coinbination with the double-armed lever o d, rookshaft E, and alarm F, or its equivalent, constructed and operating substantially in the manner and for the purpose specified.

2. The arrangement ofthe ninp2 on the hammer t of the alarm, in com'biir ion i'vith a selflighter, E', substantially as herein described, so that by the action ofthe hammer itself the light is struck.

3. The arrangement of the circuit-breakers r and zo and their connecting-wires, in combination with the armature iz ofthe electro-magnet, and with the hammer t and bell u, con

structed and operating substantially in the manner and for the purpose herein set forth. 4. The arrangement ofthe spring-frame G, in combination with theelectro-magnetic alarm F, constructed and operating substantially as and for the purpose specified.

JACOB HALLER.

Witnesses:

WM. FR. ROTH, THos. J. HAsKrNs. 

